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Finding the Fourth Proportional to 640,645.20, 959,655.60 and 325,279.80

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Solution

The fourth proportional to 640,645.20, 959,655.60 and 325,279.80 is: 487,253.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,645.20 : 959,655.60 = 325,279.80 : x
  2. Step 2: Convert to fraction form
    640,645.20/959,655.60 = 325,279.80/x
  3. Step 3: Cross multiply
    640,645.20x = 959,655.60 × 325,279.80
  4. Step 4: Simplify right side
    640,645.20x = 312,156,581,636.88
  5. Step 5: Solve for x
    x = 312,156,581,636.88/640,645.20
  6. Step 6: Final answer
    x = 487,253.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.